检索结果-南通市图书馆

Journal of Wuhan University of Technology(Materials Science) 2024年第1期39卷 182-187页

作者： ÇElİK erçevik ATA ESENer pınar ÖZTÜRK Esra AKSÖZ Sezen Nevşehir HacıBektaşVeli University Department of Physics50300NevşehirTurkey erciyes University Graduate School of Natural and Applied Sciences38039KayseriTurkey Kocaeli University Department of Physics41380KocaeliTurkey

Ag-In intermetallic alloys were produced by using vacuum arc furnace. Differential Scanning Calorimetry(DSC) and Energy Dispersive X-Ray Spectrometry(EDX) were used to determine the thermal properties and chemical composition of the phases respectively. Microhardness values of Ag-In intermetallics were calculated with Vickers hardness measurement method. According to the experimental results, Ag-34 wt%In intermetallic system generated the best results of energy saving and storage compared to other intermetallic systems. Also from the microhardness results, it was observed that intermetallic alloys were harder than pure silver and Ag-26 wt%In system had the highest microhardness value with 143.45 kg/mm^(2).

关键词： thermal properties microstructure characterization microhardness alloys material characterization

在线全文

学校读者我要写书评

暂无评论

World Journal of Emergency Medicine 2024年第4期15卷 256-262页

作者： Jie er Janice Soo Yuan Helen Zhang Gek Hsiang lim Fatimah lateef Department of Emergency Medicine Singapore General HospitalSingapore 168753Singapore Health Services Research Unit Singapore General HospitalSingapore168753Singapore

BACKGROUND:This study aimed to review bicycle-related injuries during the COVID-19 pandemic to assist with reinforcement or implementation of new policies for injury ***:This is a retrospective descriptive analysis of injuries sustained during cycling for patients 18 years old and above who presented to Singapore General Hospital from January to June *** records were reviewed and *** analyses were used to summarize patient characteristics,and differences in characteristics subgrouped by triage acuity and discharge status were ***:The study included 272 patients with a mean age of 43 years and a male predominance(71.7%).Most presented without referrals(88.2%)and were not conveyed by ambulances(70.6%).Based on acuity category,there were 24(8.8%)priority 1(p1)patients with 7 trauma activations,174(64.0%)and 74(27.2%)p2 and p3 patients *** most common injuries were fractures(34.2%),followed by superficial abrasion/contusion(29.4%)and laceration/wound(19.1%).Thirteen(4.8%)patients experienced head injury and 85 patients(31.3%)were documented to be wearing a *** majority occurred on the roads as traffic accidents(32.7%).Forty-two patients(15.4%)were admitted with a mean length of stay of 4.1 d and 17(6.3%)undergone surgical *** of 214(78.7%)discharged patients,no re-attendances or mortality were *** the subgroup analysis,higher acuity patients were generally older,with higher proportions of head injuries leading to ***:Our study highlights significant morbidities in bicycle-related *** is also a high proportion of fractures in the young healthy male *** prevention is paramount and we propose emphasizing helmet use and road user safety.

关键词： Cycling Injuries Emergency department

Quantitative characterizations of anisotropic dynamic properties in organic-rich shale with different kerogen content

在线全文

学校读者我要写书评

暂无评论

petroleum Science 2024年第2期21卷 855-865页

作者： Jian-Yong Xie Yan-ping Fang Xing-Hua Wu Jian'er Zhao Jun-Cheng Dai Jun-Xing Cao Ji-Xin Deng State Key laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of TechnologyChengdu610059SichuanChina Key lab of Earth Exploration&Information Techniques of Ministry of Education Geophysical InstituteChengdu University of TechnologyChengdu610059SichuanChina petroChina Southwest Oil&Gasfield Company Chengdu610017SichuanChina

Understanding the quantitative responses of anisotropic dynamic properties in organic-rich shale with different kerogen content(KC)is of great significance in hydrocarbon exploration and *** controlled experiments with a single variable is challenging for natural shales due to their high variations in components,diagenesis conditions,or pore *** employed the hot-pressing technique to construct 11 well-controlled artificial shale with varying *** artificial shale samples were successive machined into prismatic shape for ultrasonic measurements along different *** revealed bedding perpendicular p-wave velocities are more sensitive to the increasing KC than bedding paralleling velocities due to the preferential alignments of *** elastic stiffnesses except C_(13)are generally decreasing with the increasing KC,the variation of C_(1) and C_(33)on kerogen content are more sensitive than those of C_(44)and C_(66).Apparent dynamic mechanical parameters(v and E)were found to have linear correlation with the true ones from complete anisotropic equations independent of KC,which hold value towards the interpretation of well logs consistently across formations,Anisotropic mechanical parameters(ΔE and brittlenessΔB)tend to decrease with the reducing KC,withΔB showing great sensitivity to KC *** the range of low KC(p)/V_(S) ratio demonstrated a linearly negative correlation with KC,and the V_(p)/V_(S) ratio magnitude of less than 1.75may serve as a significant characterization for highly organic-rich(>10%)shale,compilation of data from natural organic rich-shales globally verified the similar systematic relationships that can be empirically used to predict the fraction of KC in shales.

关键词： Elastic properties Organic shale Anisotropy Kerogen content physical modeling

Facile preparation of Fe/N-based biomass porous carbon composite towards enhancing the thermal decomposition of DAp-4

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2024年第1期31卷 288-294页

作者： er-hai An Xiao-xia li Cun-juan Yu Ying-xin Tan Zi-jun Fan Qing-xia li peng Deng Xiong Cao School of Environment and Safety Engineering North University of ChinaTaiyuan030051PR China College of Safety and Emergency Management Engineering Taiyuan University of Science and TechnologyTaiyuan030024PR China

Fe/N-based biomass porous carbon composite(Fe/N-p Carbon) was prepared by a facile high-temperature carbonization method from biomass,and the effect of Fe/N-p Carbon on the thermal decomposition of energetic molecular perovskite-based material DAp-4 was *** porous carbonaceous materials was considered as the micro/nano support layers for in situ deposition of Fe/N ***/Np Carbon was prepared simply by the high-temperature carbonization *** was found that it showed the inherent catalysis properties for thermal decomposition of *** heat release of DAp-4/Fe/N-p Carbon by DSC curves tested had increased slightly,compared from DAp-4/Fe/N-p *** decomposition temperature peak of DAp-4 at the presence of Fe/N-p Carbon had reduced by 79°C from384.4°C(pure DAp-4) to 305.4°C(DAp-4/Fe/N-p Carbon-3).The apparent activation energy of DAp-4thermal decomposition also had decreased by 29.1 J/*** possible catalytic decomposition mechanism of DAp-4 with Fe/N-p Carbon was proposed.

关键词： Biomass materials porous carbon DAp-4 Thermal decomposition Facile method

NiS ultrafine nanorod with translational and rotational symmetry

在线全文

学校读者我要写书评

暂无评论

National Science Review 2024年第7期11卷 218-225页

作者： Jianxin Kang Qi Hu Ruixuan Zhang Ang Gao Zhongning Huang Ziming Su Ke pei Qinghua Zhang li-Min liu Renchao Che lin Gu er-Jia Guo lin Guo School of Chemistry Beihang University laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative Materials Academy for Engineering&Technology Fudan University Zhejiang laboratory Beijing National Center for Electron Microscopy and laboratory of Advanced Materials School of Materials Science and Engineering Tsinghua University Beijing National laboratory for Condensed Matter physics and Institute of physics Chinese Academy of Sciences School of physics Beihang University

Anisotropy is a significant and prevalent characteristic of materials, conferring orientation-dependent properties, meaning that the creation of original symmetry enables key functionality that is not found in nature. Even with the advancements in atomic machining, synthesis of separated symmetry in different directions within a single structure remains an extraordinary challenge. Here, we successfully fabricate NiS ultrafine nanorods with separated symmetry along two directions. The atomic structure of the nanorod exhibits rotational symmetry in the radial direction, while its axial direction is characterized by divergent translational symmetry, surpassing the conventional crystalline structures known to date. It does not fit the traditional description of the space group and the point group in three dimensions, so we define it as a new structure in which translational symmetry and rotational symmetry are separated. Further corroborating the atomic symmetric separation in the electronic structure, we observed the combination of stripe and vortex magnetic domains in a single nanorod with different directions, in accordance with the atomic *** manipulation of nanostructure at the atomic level introduces a novel approach to regulate new properties finely, leading to the proposal of new nanotechnology mechanisms.

关键词： separated symmetry NiS anisotropy structure atomic machining magnetic domain

A facile strategy for tuning the density of surface-grafted biomolecules for melt extrusion-based additive manufacturing applications

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Bio-Design and Manufacturing 2024年第3期7卷 277-291页

作者： I.A.O.Beeren G.Dos Santos p.J.Dijkstra C.Mota J.Bauer H.Ferreira Rui l.Reis N.Neves S.Camarero-Espinosa M.B.Baker l.Moroni Department of Complex Tissue Regeneration MERLN Institute for Technology-Inspired Regenerative MedicineMaastricht University6229 ER MaastrichtThe Netherlands 3B’s Research Group I3Bs–Research Institute on BiomaterialsBiodegradables and BiomimeticsHeadquarters of the European Institute of Excellence on Tissue Engineering and Regenerative MedicineUniversity of MinhoAveParkZona Industrial da Gandra4805-017 BarcoGuimarãesPortugal ICVS/3B’s-pT Government Associate laboratory 4806-909 Braga/GuimarãesPortugal pOlYMAT University of the Basque Country UPV/EHU20018 Donostia/San SebastiánSpain IKerBASQUE Basque Foundation for Science48009 BilbaoSpain

Melt extrusion-based additive manufacturing(ME-AM)is a promising technique to fabricate porous scaffolds for tissue engi-neering ***,most synthetic semicrystalline polymers do not possess the intrinsic biological activity required to control cell *** of biomolecules on polymeric surfaces of AM scaffolds enhances the bioactivity of a construct;however,there are limited strategies available to control the surface ***,we report a strategy to tune the surface density of bioactive groups by blending a low molecular weight poly(ε-caprolactone)5k(pCl5k)containing orthogonally reactive azide groups with an unfunctionalized high molecular weight pCl75k at different *** porous three-dimensional(3D)scaf-folds were then fabricated using a high weight percentage(75 wt.%)of the low molecular weight pCl *** a proof-of-concept test,we prepared films of three different mass ratios of low and high molecular weight polymers with a thermopress and reacted with an alkynated fluorescent model compound on the surface,yielding a density of 201-561 pmol/cm^(2).Subsequently,a bone morphogenetic protein 2(BMp-2)-derived peptide was grafted onto the films comprising different blend compositions,and the effect of peptide surface density on the osteogenic differentiation of human mesenchymal stromal cells(hMSCs)was *** two weeks of culturing in a basic medium,cells expressed higher levels of BMp receptor II(BMpRII)on films with the conjugated *** addition,we found that alkaline phosphatase activity was only significantly enhanced on films contain-ing the highest peptide density(i.e.,561 pmol/cm^(2)),indicating the importance of the surface *** together,these results emphasize that the density of surface peptides on cell differentiation must be considered at the cell-material ***,we have presented a viable strategy for ME-AM community that desires to tune the bulk and surface functionality via blending of(m

关键词： Additive manufacturing Blending Surface functionalization Surface density Click chemistry Human

Super p and MoO_(2)/MoS_(2)co-doped gradient nanofiber membrane as multi-functional separator for lithium–sulfur batteries

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第9期43卷 4263-4273页

作者： Xin liang Dong-Qing Zhao Qian-Qian Huang Sheng liang li-li Wang lei Hu ling-li liu Kun-Hong Hu Chong-Hai Deng Sheng Cheng er-Tao Zhu Hua-Xia Deng School of Energy Materials and Chemical Engineering LIB Technology Center of Anhui ProvinceHefei UniversityHefei 230601China Instrumental Analysis Centre Hefei University of TechnologyHefei 230009China Hefei Youngy Energy Materials Co. Ltd.Hefei 230000China Department of Modern Mechanics University of Science and Technology of ChinaHefei 230026China

lithium-sulfur battery is one of the most promising battery systems for industrialization due to its high theoretical specific capacity and high energy ***,the"shuttle effect"has restrained the advancement of lithium-sulfur *** this work,a gradient-structured nanofiber membrane with pure gelatin on one side and Super p-MoO_(2)/MoS_(2)-gelatin on the other side was created using a multi-step electrostatic spinning technique,which was applied for multi-functional separator for lithium-sulfur *** pure gelatin layer facing the anode side primarily homogenizes the lithium flux,whereas the Super p-MoO_(2)/MoS_(2)-gelatin layer facing the cathode side primarily adsorbs polysulfides by physical and chemical adsorption and enhancing polysulfide conversion *** findings demonstrate that even after 150 cycles at 0.2C,the lithium-sulfur battery can still sustain a discharge-specific capacity of 572.3 mAh·g^(-1).When used with li||li symmetric batteries,it has a cycle life of more than 1200 *** commercialization of lithium-sulfur batteries is given a fresh idea by this straightforward preparation technique.

关键词： MoO_(2)/MoS_(2) Nanofiber Membrane li-S battery

在线全文

学校读者我要写书评

暂无评论

高分辨率罗兰圆光学系统的色差校正方法研究

光谱学与光谱分析 2024年第7期44卷 2011-2017页

作者：陈吉文陈作儿北方工业大学电气与控制工程学院北京100144

罗兰圆光学系统优点众多,但系统中因平凸透镜的使用,导致各特征波长色散后的成像点在罗兰圆附近产生了一定量的偏移量,使得各波长成像点依次排列在一条曲面上。由于目前新型采集器件线阵CMOS或CCD的使用,而这类传感器的感光面是一个平面... 详细信息

罗兰圆光学系统优点众多,但系统中因平凸透镜的使用,导致各特征波长色散后的成像点在罗兰圆附近产生了一定量的偏移量,使得各波长成像点依次排列在一条曲面上。由于目前新型采集器件线阵CMOS或CCD的使用,而这类传感器的感光面是一个平面,因此导致结果产生较严重的色差。提出了一种使用加权最小二乘法拟合像面的色差校正方法,并计算出系统像面的中心偏移距和偏移倾斜角这两个校正参数,将其引入原本罗兰圆光学系统进行色差校正,从而确定线阵光电传感器像面的最佳位置,实现高分辨率。此外在真空紫外光谱中C、p和S等元素非常重要,可使用本文提出的基于加权最小二乘法的色差校正方法,通过增加这类元素权值占比,实现最优分辨率。最后通过Zemax软件进行光学仿真,完成了罗兰圆光学系统的仿真以及优化。并给出170~410 nm波段点列图的成像宽度仿真以及各元素特征波长在CMOS传感器上所采集到的光谱图,推算出其实际应用中的分辨率,其照度光谱图显示其分辨率均可保持在0.02 nm,接近系统理论最佳分辨率。研究结果表明基于加权最小二乘法拟合像面的方法,可实现罗兰圆光学系统的色差校正,实现高分辨率。

关键词：罗兰圆光学系统平凸透镜色差校正高分辨率加权最小二乘法

Microbial phenolic metabolites are associated with better frontal lobe cognition

在线全文

学校读者我要写书评

暂无评论

Food Science and Human Wellness 2024年

作者： Inés Domínguez-lópez Isabella parilli-Moser Anna Vallverdú-Queralt Anna Tresserra-Rimbau Cinta Valls-pedret Zenaida Vázquez-Ruiz Olga Casta?er Ramon Estruch Emili Ros Rosa M.lamuela-Raventós lipid Clinic， Endocrinology and Nutrition Service， Institut d'Investigacions Biomèdiques August pi i Sunyer， Hospital Clínic 08036 Barcelona， Spain Unit of Cardiovascular Risk and Nutrition， Institut Hospital del Mar de Investigaciones Médicas (IMIM) Department of preventive Medicine and public Health， University of Navarra Departament de Nutrició， Ciències de l'Alimentació i Gastronomía， Facultat de Farmacia， Universitat de Barcelon (UB)， Av.de Joan XXII Department of Endocrinology， Hospital Clinic IDIBAPS， Barcelona， Spain Department of Internal Medicine， Hospital Clinic， Institut d'Investigació Biomèdica August pi i Sunyer (IDIBApS)， University of Barcelona CIBer Fisiopatología de la Obesidad y Nutrición (CIBerOBN)， Instituto de Salud Carlos III Institut de Nutrició i Seguretat Alimentària (INSA)， Universitat de Barcelona (UB)

With increasing life expectancy， neurodegenerative diseases have become one of the leading causes of ill-health in the elderly. preventive strategies include following healthy diets， such as the Mediterranean diet， which is particularly rich in polyphenols， bioactive compounds with neuroprotective properties. The aim of this study was to assess the association of microbial phenolic metabolites (MpM) with cognition. This cross-sectional analysis was performed with 200 participants of the pREDIMED trial (Barcelona-Clinic recruitment center). A novel method based on liquid chromatography coupled to mass spectrometry was used to identify urinary MpM (protocatechuic acid， enterodiol glucuronide， enterolactone glucuronide， urolithin B glucuronide， and vanillic acid glucuronide)， and cognitive function was evaluated with neuropsychological tests. Multivariable-adjusted ordinary least squares regression was used to assess the associations between cognitive function and MpM， and a score was calculated as the weighted sum of MpM. A higher MpM score was associated with better frontal lobe function. Among individual metabolites， vanillic acid glucuronide was correlated with frontal cognitive performance. participants with higher concentrations of vanillic acid glucuronide and urolithin B glucuronide obtained better scores in the Color Trail Test part 2. A higher score for urinary multi-MpM was associated with better frontal cognitive performance in an older Mediterranean population.

关键词：

presynaptic endoplasmic reticulum architecture and hereditary spastic paraplegia

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2024年第3期19卷 485-486页

作者： Juan Josépérez-Moreno Instituto de Biomedicina de Sevilla(IBiS) Hospital Universitario Virgen Del Rocío/CSIC/Universidad de Sevillaand Departamento de Biología CelularFacultad de BiologíaUniversidad de SevillaSevilleSpain

Hereditary spastic paraplegia(HSp)is a clinically and genetically heterogeneous neurodegenerative disorder,characterized primarily by progressive spasticity and weakness in the lower *** ients can also experience peripheral neuropathy,cognitive impairment,and other neurological *** date,more than 80 genes have been implicated in HSp,encompassing various cellular components,although mutations in genes encoding endoplasmic reticulum(er)-shaping proteins are the most prevalent(parodi et al.,2017).er-shaping proteins are generally known for regulating the tubulation and curvation of the er,but most of them show additional functions,including fusion of er tubules,microtubule-severing,er autophagy,lipid droplet synthesis,contact sites with other organelles(Öztürk et al.,2020).This highlights the complexity of studying the role of these proteins and the link between er function and HSp.

关键词： reticulum endoplasmic